Steam boiler



March 30 1926.

A. C. MCCLURE STEAM BOILER 4 sheets-sheet 1 Filed Feb. 14. 1924 Qwugmtoi df: 61ML: Clare M iig-ii gi- March 30 1926. 1,579,012

A. C. MccLuRE STEAM BOILER Filed Feb. 14,- 1924 4 sheets-sheet 2 oOOooooo'ooo oooouoooooo oooo A. C. MCCLURE March 30 1926.,

STEAM BOILER 4 sheets-sheet- 5 Filed Feb. 14. 1924 Y gwventoz 02 l1@ 'Zure,

March 30 A. c. MCCLURE u sTEAM BOILER g Filed Feb. 14. 1924 4 Sheets-Sheet Patented Mar. 30, 1926.

' asia-enf.'

ALEXANDER o, MGCLUEE, or LonrsvrLLE, KENTUCKY.

" STEAM EoILER.

Applicationiiled February 14, 19,24; kSerial No. 692,815.

T0 cZZ'ww'm it may concern.' Y

Be it known that, I,.ALExAvnnn C. Mo-v CLURE, a citizen ofthe United States, resid-` ing at Louisville, in the lcountyof Jefferson and State of Kentucky, have invented certain new and useful Improvements inSteam Boilers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such yas will enable 'others skilled in the art to which it appertains to make and usethe same. f The invention has relation toboilers and more particularly to the type designed for generating steam and has for its'objcct to replace the usual re arch of refractory material by an 'arch' whichlfis hollow 'and -Some of the objects of theinvention may be brieflystated as follows, namely-a material increase in the direct heating surface of the firebox, an increase in the steaming capacity of the engine, a more positive and better circulation of the water, a material lsaving in the consumption of fuel, a material reduction in the stagnated points in the boiler, and the maintaining of a higher degree of temperature throughout Vthe entire body of water in the boiler.

Another object of the invention is that, by providing additional, direct heating surface by'means ofl the water arch, maintenance of full boiler pressure will be more easily accompli'shed, so that the draft may be modified 'by increasing the capacity of the exhaust nozzle tip regulating the draft on the fire and by so doing'lessen impedance of the exhaust steam, or, in other words, provide for a less restricted discharge of the exhaust steam, and thereby lower the compressionpin the cylinders.

Other objects and advantages will be apparent and suggest themselves as' the nature of the invention is understood.

While the drawings illustrate an embodiment of the invention it is to be understood saisar Aom*esj-1i that in adapting the same ltomeet different l conditions and requirements', various changes in the form, proportion andv minor details of construction may be resorted to without yde,- parting `from the spirit of the invention.` l Referring to thev accompanying drawings forming a part of the application: V'

Figure l is a vertical ,longitudinal section of the firing end ofa steam boilerprovided with .a water archV within` the iirebox ein# bodyingfthe inventiom I Figure 2 is a vertical-transverse sectional View on they line 2 2 of Figure l, looking inthe direction ofthe arrows," Figure 3 is ar sectional viewonthe Vline 3 3y of Figure l, looking inthe direction n of the. arrows, Y Y 1 Figureais an enlargedzdetail sectio'na] view showing more clearly the stay bolt coni nectionA between the water arch y wall or sheet fof the boiler,V f

Figure 5. is a detail sectional;'viewoii the' lined-'5 of Figure 4,*looking-to `thefleft so as indicated-by the arrowsfl the manner lof connecting the" upper-ends of the water columns of the `water arch tothe crown sheetof the` fi'rebox,y

Figure 7 is a similar view showing the manner of connecting the lower ends of the water columns to the water arch,

Figure 8 is a top plan view ofthe water arch assembly, and v lFigure `9 a detail of one of the stay bolts. Corresponding and like parts are referred to lin the following description and desigian/d the outer` Figure Gis a detail sectional view showing nated in the several views' of the drawings;v

by like reference characters.k *e

The steam boiler illustratedis of the horizontal flue type such as used in connection stay bolts 4; and opposite edge portions are crimped or fluted, as indicated at 5and are electrically Welded or jointed in any preferred way to the side walls of the fireboX. Brackets 7 riveted or otherwise attached to the inner sides of the upper and lower walls of the water arch are connected by stay boltsv ment of the staybolt. A capl closesV the outer end of each of the nipples l() Vand is preferably threaded thereto, 4whereby pro-V vision is had for access to tlie' stay bolt.

The upper rear end ofthe waterarch 2 is connected to the crown V sheet lil ofthe fireboX by means of water columns 18 and the end portions of the latter are outwardly Vflanged and'crimped or corrugated, as shown l at 15, to allow for 'contraction' and expansion,

said flanged ends being kwe ldedoi'- otherwise jointed to the crown "sheet lll and t'o the sheet forming a part ofthe water arch.` Hollow stay bolts pass transversely through the water columns Vandv vbr'acingly connect opposite portions thereof. Tubes lf? connect the lower forward end of the water arch to the lower portion vof the flue sheetj- -and the space thus'formed between the lowerend of the flue sheet 1 8 and the lower Vfront end of. the Water arch may be] closed. by a tile or fire brick 19, @11" may be left Oren' .thereby preventin ashes, eind-ers and vthe like from accumulating on the top of the water arch as well als by retarding the gases from the fuel so that they are thoroughly ignited in the fire boX, enabling the tubes l7 to function moreV eifectively for heating the water. Suitable plugs 20 are provided for closing openings in Ythe'outer sheets or wallsv of the expansion and the peculiar connection of Vthe stay bolts 8 with the outer walls provides in elfect a ball andV socket joint whereby said stay bolts may move with the water arch Ywhen contractingV and expanding without tending to break joint attheir outer ends with the outer walls of the boiler.

Whatv is claimed is: a

In a steam boiler, a hollow'arch located in the rear portion `of the fire box and .inclined downwardly vtowards theV rear .wall thereof, said arch being made of sheet metal and having open ends secured. to' the'innfer Walls of `the opposite sides of the fire box, said open ends having outwardly directed integral flanges secured to ,said inner `walls by welding, the flanges being iluted to pro]` vide compensation `for contraction andl ex-y pansion of the boiler plates, the lower end of said arch being spaced from theflue sheet Y at the rear of the fire box, tubes connecting the flue sheet and said lower endof the arch, and water columns Iconnecting the upper end of the arch and the crown sheet.

In testimony whereof I afiix my signature.

ALEXANDER@ Mctuan" 

